Question

A) f(x)=x²+4x-3
B) f(x)=2x²2+1

Answer 1

Resposta:

-4,64 e 0,64

Explicação passo-a-passo:

f (x)=

${x}^{2} + 4x - 3 = 0$

a=1 b=4 c= - 3

$delta = {x}^{2} - 4.a.b \\ delta = {4}^{2} - 4.a.c \\ delta = 16 + 12 \\ delta = 28$

$x = \frac{ - 4 + \sqrt{28} }{2} = \frac{ - 4 + 5.29}{2} = \frac{1.29}{2} = 0.64 \\ {x }^{2} = \frac{ - 4 - 5.29}{ 2} = \frac{ - 9.29}{2} = - 4.64$